Derrick.



A. P. JHNSEN.

DERRIGK.

APPLICATION FILED DBC. 20, 1910. y, Patented May 5, 1913.

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DBRMOK.

APPLICATION FILED DBO. 20, 1910.

jwsmgQ@ Pated may 6, 1913.

cierran srafrs sarna eiseres.

AKSEL P. JOHNSEN, OF CHICAGO, ILLINOIS.

DERRICK.

iuosdees.

Specification o'f Letters Patent.

Application filed December 20`, 1910. Serial No. 598,340. f

to turn bodily, so that the load may be lifted from and deposited at anypointwithin the 'radius of the boom.

of the invention Yis to provide an apparatus as stated in which thesource of motive power for turning the mast and boom shall beconveniently arranged so as not to encroacli upon the space in which theboom moves.

A further object of my invention is to provide a derriek which shall -besimple of construction, strong and durable, and cient in operation.

Other objects will appear hereinafter.

With these objects in view my invention consists in the novelconstruction and arrangements of parts all as will be hereinafter morefully described and particularly pointed out in the appended claim.

My invention will be best understood by reference to the accompanyingdrawings forming a part of this specification and in which Figure 1 is aside elevation of my improved derrick, and Fig. 2 is a top plan viewthereof.

The preferred form of my invention as illustrated in the accompanyingdrawings comprises an L-shaped frame 1 which is rigidly anchored to thcground in any desired place, the anchoring means not being shown in thedrawings. At the juncture of the uieu'ibers composing the frame l abearing block 2 is provided which is adapted to support the mast 3 asclearly illustrated in Fig. 1. The upper end of the mast 3 is providedwith an axial pin 4 to receive the perforated lugs 5 of the bracemembers G, the lower ends of the latter being provided with perforatedside plates 7 which are spaced to embrace the members of the frame 1. Inorder to secure the brace members G to the members of the frame 1 afterthe members 7 areproperly positioned the pins The object .8 are passedthrough the latter and the members of the fra-mel as clearly illustratedin the several views. The pins 8 are readily removable so that wlienitis desired'to take down the derrick said pins are removed and the upperends of Athe members 6 disengaged from the nin 1. thusseparating theparts for boom 9 is hinged to the lower end of the mast 3 by,

10, and the same is adapted ease in transportation. The

means of a pin to revolve with ner.

said mast in the usual manby means of a block and tackle 13, the fallline` 14 of said block and tackle passing over a pulley 15 provided onthe boom 9 and extending downwardly therethrough and thence to theengine or other source of power as will be understood by those skilledin the ait. An ordinary block and tackle 16 having a lifting hook 17 isconnected to the free end 11 of the boom 9 and the fall line.17 thereofpasses over a pulley 18 and thence downwardly fall line 14.

From the foregoing construction it' is apparent that the mast 3 and boom9 are so mounted as to operate through an angle of 270, the said mastand boom being located between the L-sliaped members of the frame 1,thus being confined to an angle of 90. The lower end of the mast 3 restsupon a Worm `wheel 19 `having a hub 20 from which the joui-nal 2lprojects into the bearing block 2 as indicated by dotted lines inFig. 1. Said worm wheel meshes with and is driven by a worm 22 which ismounted on the shaft 23, thus forming a non-reversing driving connectionbetween said shaft and the mast 3. The shaft 23 is joui'naled in abearing block 24 which is secured to one of the members of the frame 1and in bearing blocks 25 which are formed integral with a base 26 whichwill be presently described. A driven spur gear 27 is provided on theshaft 23 and meshing therewith is a driv'- ing pinion 28 which iscarried by a motor shaft 29, the motor 30 being preferably electric as'indicated.

The base 26 having the bearing blocks 25 and supporting the motor 30 isrigidly connected to the members of the frame 1 by means of a framelwork31. Hence the frame Work 31 serves two purposes, that of pro- IateiatedMay 6, 1913. i

The free end 11 of the boom 9 is con-l nected to an eye 12 provided onthe mast 3'- motive apparatus for revolving to the cng'ine the same asthe viding a rigid Asupport for the motive api paratus and inmaintaining the members of the frame 1 in proper relative disposition.

It Will be observed that when the members otl the frame l are properlyanchored for securing the derricl in any7 particular oper ative positionthat the lmotive apparatus for revolving the mast 3 and the boom 9 willalways be in proper, position for operation, thus `facilitating thequick placing of the derrick. y

A derrick of the construction set'forth is simple of construction 'andportable2 hence is particularly adapted for many work. Y A 4 While Ihave shown the-prefeia elzcnstructlion for carryin'g lny inventionl intoeffect there might be various chaugesmade in the arrangements of partsand details di construction Without departing from the spirit oftheinvention, hence I desire to lines of avail myself of such variationsand modifications as come within the scope of the appended claim.

Having described my invention what I claim as new and desire tosecure'byLetters Patent is:

larly"disposed horizontal base members, a swinging mast mounted thereon,a motor,- a

from, a frame vrigidly but detac ably con# bers' and rigidly spacing thelatter apart, a shaft driven by said motor, bearings for said shaft onsaid bed plate and one of said ybase members, a gearing connecting thelower epd of said mast and the adjacent entil 'L of sa id. 'glia Effsubstantially as. described. y I1i.testifpiony"wliereof I have signedAmy l -nalne to this specification in the presence of 'two subscribingWitnesses.

AKSEL P. JOHNSEN.

In a knock-down derrick, a, pai of angu-A- "so bed plate for said motorarranged between v said base members and spaced a art therenectingl saidbed, plate and said base memj

